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Change this
<img class="nature" src="img_snowtops.jpg" width="100%">
<img class="nature" src="img_mountains.jpg" width="100%">
<img class="nature" src="img_nature.jpg" width="100%">
<script>
w3.slideshow(".nature", 1500);
</script>
<p>
<button onclick="w3.hide('#London')">Hide London</button>
<button
onclick="w3.show('#London')">Show London</button>
</p>
<div
id="London" class="w3-container w3-red">
<h2>London</h2>
<p>London is
the capital city of England.</p>
</div>
<div id="Paris"
class="w3-container w3-green">
<h2>Paris</h2>
<p>Paris is the capital of
France.</p>
</div>
<div id="Tokyo" class="w3-container w3-blue">
<h2>Tokyo</h2>
<p>Tokyo is the capital of Japan.</p>
</div>
You have just learned the basics of using a JavaScript library.